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Derris trifoliata is a perennial woody climber.Â It blooms massively for about two weeks in July/August. The flowers are hermaphroditic, feebly protandrous, self-compatible and display a vector dependent mixed breeding system.Â They close back by the end of the day of anthesis.Â The forenoon anthesis and pollen and nectar as rewards attract daytime foragers.Â The nectar feeding foragers require strength to depress the keel petals in order to collect nectar; only those foragers which have the required strength to do so can collect nectar and in the process trip the floral mechanism and effect pollination. When floral explosion occurs, the pollen is somewhat exposed and the pollen feeding foragers then collect it.Â Both long- and short-tongued bees trip the flowers, collect nectar and effect pollination. Individual flowers that were not tripped by insects set fruit to negligible level.Â In open-pollination mode, fruit set rate is up to 30-31% only despite the flowers being visited by insect pollinators.Â Fruits mature quickly within a month.Â Each fruit contains 1-3 seeds against 6 linearly arranged ovules in the ovary.Â The fruits are leathery and possess air cavities, the characteristics of which enable them to float in tidal water.Â They settle at the parent plant if the site is partly or fully exposed or float for dispersal if the site is inundated with tidal water.Â Seed release occurs when fruits absorb water and the pericarp breaks.Â Seeds germinate only when they reach a suitable habitat in mangroves.Â ÂÂ
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